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$80+ Cheap flights from South Dakota to Illinois

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/26. Fares are subject to change and may not be available on all flights or dates of travel.
FSD — ORD
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
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Cheap flight deals from South Dakota to Illinois

Cheapest flights from South Dakota to Illinois
Explore the most affordable flight options available from South Dakota to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 29, 2026.

This American Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/286:07 pm
FSD
-
ORD
Nonstop1h 45m
American Airlines
Sat 8/2910:20 pm
ORD
-
FSD
Nonstop2h 07m
American Airlines
Deal found 1/28$189
This American Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/137:42 pm
FSD
-
ORD
Nonstop1h 48m
American Airlines
Wed 2/185:19 pm
ORD
-
FSD
Nonstop1h 51m
American Airlines
Deal found 1/28$204
This Delta deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/710:50 am
FSD
-
MDW
1 stop5h 24m
Delta
Tue 3/107:20 pm
MDW
-
FSD
1 stop3h 44m
Delta
Deal found 1/27$209
This Delta deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/241:20 pm
FSD
-
ORD
1 stop3h 29m
Delta
Mon 10/265:20 pm
ORD
-
FSD
1 stop5h 31m
Delta
Deal found 1/28$209
This United Airlines deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/117:45 am
FSD
-
ORD
Nonstop1h 48m
United Airlines
Sun 6/147:57 pm
ORD
-
FSD
Nonstop1h 50m
United Airlines
Deal found 1/27$212
This Delta deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/205:15 am
FSD
-
MDW
1 stop3h 23m
Delta
Mon 8/241:00 pm
MDW
-
FSD
2 stops9h 46m
Delta
Deal found 1/27$214
This United Airlines deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/202:45 pm
RAP
-
ORD
1 stop7h 10m
United Airlines
Sun 4/127:55 pm
ORD
-
RAP
Nonstop2h 41m
United Airlines
Deal found 1/27$219
This United Airlines deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/1011:22 am
FSD
-
ORD
Nonstop1h 53m
United Airlines
Sat 2/148:45 am
ORD
-
FSD
Nonstop2h 01m
United Airlines
Deal found 1/27$219
This United Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/196:45 pm
FSD
-
ORD
Nonstop1h 50m
United Airlines
Sun 2/228:05 pm
ORD
-
FSD
Nonstop1h 52m
United Airlines
Deal found 1/28$220
This Delta deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/248:05 am
FSD
-
MDW
1 stop5h 00m
Delta
Tue 3/31:49 pm
MDW
-
FSD
1 stop5h 52m
Delta
Deal found 1/27$224
This Delta deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/41:00 pm
FSD
-
ORD
1 stop5h 01m
Delta
Sun 3/86:15 am
ORD
-
FSD
1 stop4h 06m
Delta
Deal found 1/27$224
This United Airlines deal was found by Cheapflights users on 1/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/195:40 pm
RAP
-
ORD
1 stop5h 19m
United Airlines
Mon 2/235:50 pm
ORD
-
RAP
1 stop5h 26m
United Airlines
Deal found 1/26$229

Find flight deals from South Dakota to Illinois

Keep the following information in mind while searching for South Dakota to Illinois flight deals. Data was last updated January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$189
(United Airlines)

One-way from

$80
(Priceline)

Popular in

March

Cheapest in

September

Average price

$251

Good round-trip deal

$306 or less

Good one-way deal

$289 or less
Provider with most accurate pricing for Sioux Falls Joe Foss Field-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Sioux Falls Joe Foss Field-Chicago (CHI) flights.
Search Deals
From South Dakota to Illinois
Search Deals
One-way flight from South Dakota to Illinois
Search Deals
Highest demand for flights based on searches. 2% potential increase in price ($6 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals
Price to beat on a round-trip flight from South Dakota to Illinois.
Search Deals
Price to beat on a one-way flight from South Dakota to Illinois.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from South Dakota to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 29, 2026.
Use the filters below to find and compare flights from South Dakota to Illinois that are best for you.

Fly from

South Dakota

Fly to

Illinois

Route

Depart

Return

Price

Sioux FallsChicago

FSD - ORD

FSDORD

Sioux Falls Joe Foss Field

Tue 2/24

7:40 am-9:32 am

Nonstop1h 52m

Chicago O'Hare Intl

Tue 3/3

3:35 pm-5:21 pm

Nonstop1h 46m

$189

Sioux FallsChicago

FSD - ORD

FSDORD

Sioux Falls Joe Foss Field

Fri 4/17

6:35 pm-8:32 pm

Nonstop1h 57m

Chicago O'Hare Intl

Sun 4/19

7:58 pm-9:49 pm

Nonstop1h 51m

$189

Sioux FallsChicago

FSD - ORD

FSDORD

Sioux Falls Joe Foss Field

Wed 5/6

6:31 pm-8:29 pm

Nonstop1h 58m

Chicago O'Hare Intl

Sat 5/9

7:55 pm-9:47 pm

Nonstop1h 52m

$189

Sioux FallsChicago

FSD - MDW

FSDMDW

Sioux Falls Joe Foss Field

Wed 4/15

8:05 am-1:32 pm

1 stop5h 27m

Chicago Midway

Sat 4/18

2:12 pm-7:22 pm

1 stop5h 10m

$209

Sioux FallsChicago

FSD - ORD

FSDORD

Sioux Falls Joe Foss Field

Thu 4/30

8:05 am-11:34 am

1 stop3h 29m

Chicago O'Hare Intl

Mon 5/4

7:09 pm-11:02 pm

1 stop3h 53m

$209

Sioux FallsChicago

FSD - ORD

FSDORD

Sioux Falls Joe Foss Field

Wed 5/6

1:44 pm-6:13 pm

1 stop4h 29m

Chicago O'Hare Intl

Sat 5/9

3:50 pm-7:06 pm

1 stop3h 16m

$209

Sioux FallsChicago

FSD - ORD

FSDORD

Sioux Falls Joe Foss Field

Wed 4/15

8:05 am-6:52 pm

2 stops10h 47m

Chicago O'Hare Intl

Sat 4/18

7:07 pm-11:02 pm

1 stop3h 55m

$214

Sioux FallsChicago

FSD - ORD

FSDORD

Sioux Falls Joe Foss Field

Fri 3/27

7:43 am-9:35 am

Nonstop1h 52m

Chicago O'Hare Intl

Sun 3/29

7:58 pm-9:49 pm

Nonstop1h 51m

$220

Sioux FallsChicago

FSD - ORD

FSDORD

Sioux Falls Joe Foss Field

Thu 2/19

6:45 pm-8:35 pm

Nonstop1h 50m

Chicago O'Hare Intl

Sun 2/22

8:05 pm-9:57 pm

Nonstop1h 52m

$220

Sioux FallsChicago

FSD - MDW

FSDMDW

Sioux Falls Joe Foss Field

Thu 4/30

8:05 am-1:32 pm

1 stop5h 27m

Chicago Midway

Mon 5/4

7:16 pm-11:02 pm

1 stop3h 46m

$224

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/27

Showing 1-10 of 60 results
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Best time to book a flight from South Dakota to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from South Dakota with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from South Dakota to Illinois

What is the cheapest month to book a flight from South Dakota to Illinois?

Currently, March is the cheapest month in which you can book a flight from South Dakota to Illinois (average of $187). Flying from South Dakota to Illinois in June is currently the most expensive (average of $224). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SD to IL?

Find hourly flight availability from South Dakota to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 29, 2026.

It’s typically best to fly out from South Dakota to Illinois at noon. Doing so could potentially save you 23% on the flight price compared to flying in the afternoon, which is usually more expensive.

What is the cheapest day to fly from South Dakota to Illinois?

Use this chart to determine the cheapest time to fly round-trip from South Dakota to Illinois. Price data was last updated on January 24, 2026.

Travelers seeking maximum savings on their South Dakota to Illinois flight should consider departing on Friday mornings when fares are most often at their lowest. Saturday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from South Dakota to Illinois

Explore weekly flight availability from South Dakota to Illinois. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated January 29, 2026.

The most flights from USSD to USIL are scheduled on a Monday (13 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (8 on average).

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated January 29, 2026.
Read through reviews of airlines operating flights from South Dakota to Illinois, such as Denver Air Connection, Delta, and United Airlines. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Denver Air Connection
8.0
Very good

Overall

8.0

Entertainment

7.5

Food

8.0

Crew

9.0

Boarding

8.0

Comfort

8.5
Denver Air Connection
8.0
Very good
Denver Air Connection
8.0
Very good

Overall

8.0

Entertainment

7.5

Food

8.0

Crew

9.0

Boarding

8.0

Comfort

8.5
Delta
7.9
Good
8,127 reviews
Denver Air Connection
8.0
Very good

Overall

8.0

Entertainment

7.5

Food

8.0

Crew

9.0

Boarding

8.0

Comfort

8.5
United Airlines
7.4
Good
9,215 reviews
Denver Air Connection
8.0
Very good

Overall

8.0

Entertainment

7.5

Food

8.0

Crew

9.0

Boarding

8.0

Comfort

8.5
American Airlines
7.2
Good
11,206 reviews
Denver Air Connection
8.0
Very good

Overall

8.0

Entertainment

7.5

Food

8.0

Crew

9.0

Boarding

8.0

Comfort

8.5

Related info for your journey

Find useful and relevant information for your journey from South Dakota to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from South Dakota to Illinois?

    Airlines like United Airlines, Delta, and American Airlines fly from South Dakota to Illinois in about 1h 52m. The time it takes to get you to your destination can typically vary by up to 3h 35m. Airlines will cover a distance of 461 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from South Dakota to Illinois one-way?

    One-way options have recently been found by users for as low as $84 on Denver Air Connection. Other airlines that offer cheap prices include American Airlines from $125 and United Airlines from $144 one-way.

  • Can I find deals for flights from South Dakota to Illinois that include hotel bookings?

    Yes. In addition to deals on South Dakota to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from South Dakota to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from South Dakota to Illinois.

  • Can I find deals for business class flights from South Dakota to Illinois?

    Yes. Cheapflights offers flight deals from South Dakota to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from South Dakota to Illinois?

    Currently, March is the cheapest month in which you can book a flight from South Dakota to Illinois (average of $187). Flying from South Dakota to Illinois in June is currently the most expensive (average of $224). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for South Dakota to Illinois

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Top 3 airlines flying from South Dakota to Illinois

Discover the top 3 airlines that operate flights from South Dakota to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
Denver Air ConnectionCheapest$172Average$289FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$189Average$221FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$189Average$328FlexibilityNo cancel feeOn-time69%

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